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|  MIL-T-62320C
3.1.1.6 Drive hubs. When specified for 4x4 model vehicles (see 6.2), manually operated
drive hubs, for disengaging the front wheels from the power train, shall be provided, except for
vehicles equipped with interaxle compensating devices between the front and rear axles
(see 3.4.5.1.2).
3.1.1.7 Trailer towing package. A trailer towing package consisting of a pintle, safety chain
attachment devices, a lighting receptacle, a trailer brake control system and associated
reinforcements and wiring shall be installed on the rear of the vehicle. The pintle shall be of the
rotating type conforming to MS51335-1. The pintle shall be installed on the chassis frame with
reinforcements to transfer a vertical tongue load of not less than 1,800 pounds and a horizontal
drawbar load of not less than 18,000 pounds directly to the chassis rails. The rearmost portion of
the pintle shall be forward, but not more than 4 inches forward, of the rearmost part of the
vehicle. Two trailer safety chain attachment devices, one adjacent to each side of the pintle,
shall be provided. Each attachment device shall provide an ultimate strength at least equal to the
GVW of the truck furnished. The attachment devices shall be capable of accommodating a
standard grab hook (2-3/16 inches wide, 47/64 inch thick and 31/64-inch throat width) for a
3/8-inch chain. The lighting receptacle, conforming to SAE J560, with its conductors connected
and color-coded as specified therein, shall be mounted in a readily accessible location near the
pintle. The trailer brake control system shall conform to 3.4.11.2.
* 3.1.1.8 Trailer lighting cable. When specified (see 6.2), a trailer lighting cable, conforming
to SAE J1067, shall be furnished. The cable shall be coiled and shall be not less than 110 inches
long when fully extended. Both ends of the cable shall be equipped with a round plug
conforming to SAE J560. The plugs shall be equipped with a grip for withdrawing from the
connector sockets. The cable shall be packaged and stowed in the vehicle tool compartment.
* 3.1.1.9 Electrical trailer brake controller. When specified (see 6.2), an electric trailer brake
controller, shall be provided. The controller shall be installed in the truck cab and wired through
the SAE J560 lighting receptacle. The controller shall operate on the 12-volt electrical system of
the vehicle and shall include load control, hand lever, and accessories.
* 3.1.1.10 Wheel splash and stone throw protection. Rigid splash shields ahead of the rear
wheels and rubber mud flaps to the rear of the rear wheels, shall be furnished. Tilt cabs shall
have rubber mud flaps to the rear of the front wheels. A metal strip not less than 1/8 inch thick
and not less than one inch wide, extending the entire width of the mud flap, shall be installed to
prevent the bolt heads or bolt nuts from damaging the mud flap. As an alternate method of
attaching the mud flaps, tabs or clips with minimum surface contact dimensions of 1 inch high
by 1-1/4 inch wide by 3/32 inch thick shall be furnished at each bolt. All splash shield and mud
flap installations, front and rear, shall conform to the rear wheel splash and stone throw
protection provisions of SAE J682
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